userspace: remove vestigial '?' cases from top-level getopt(3) loops

getopt(3) returns '?' when it encounters a flag not present in the in
the optstring or if a flag is missing its option argument. We can
handle this case with the "default" failure case with no loss of
legibility. Hence, remove all the redundant "case '?':" lines.

Prompted by dlg@. With help from dlg@ and millert@.

Link: https://marc.info/?l=openbsd-tech&m=167011979726449&w=2

ok naddy@ millert@ dlg@

pledge "stdio" after opening file and before doing operations
from Rafael Neves

Change all tame callers to namechange to pledge(2).

tame "stdio rpath". could go crazy and handle the non-filename case,
but i am feeling some fatigue.

Do not need sys/cdefs.h

Use errc/warnc to simplify code.
Also, in 'ftp', always put the error message last, after the hostname/ipaddr.

ok jsing@ krw@ millert@

Include unistd.h as it is the standard location for getopt().

Import nl(1) from the NetBSD source tree, with local changes discussed
on tech@, among which `-' syntax for stdin, multibyte delimiter support
(based on FreeBSD) and various code simplifications. Original diffs
from pascal@ and later Arto Jonsson (ajonsson at kapsi dot fi),
comments and work by others, especially millert@.
"That looks good to me." millert@

pledge "stdio" after opening file and before doing operations
from Rafael Neves

Change all tame callers to namechange to pledge(2).

tame "stdio rpath". could go crazy and handle the non-filename case,
but i am feeling some fatigue.

Do not need sys/cdefs.h

Use errc/warnc to simplify code.
Also, in 'ftp', always put the error message last, after the hostname/ipaddr.

ok jsing@ krw@ millert@

Include unistd.h as it is the standard location for getopt().

Import nl(1) from the NetBSD source tree, with local changes discussed
on tech@, among which `-' syntax for stdin, multibyte delimiter support
(based on FreeBSD) and various code simplifications. Original diffs
from pascal@ and later Arto Jonsson (ajonsson at kapsi dot fi),
comments and work by others, especially millert@.
"That looks good to me." millert@

Change all tame callers to namechange to pledge(2).

tame "stdio rpath". could go crazy and handle the non-filename case,
but i am feeling some fatigue.

Do not need sys/cdefs.h

Use errc/warnc to simplify code.
Also, in 'ftp', always put the error message last, after the hostname/ipaddr.

ok jsing@ krw@ millert@

Include unistd.h as it is the standard location for getopt().

Import nl(1) from the NetBSD source tree, with local changes discussed
on tech@, among which `-' syntax for stdin, multibyte delimiter support
(based on FreeBSD) and various code simplifications. Original diffs
from pascal@ and later Arto Jonsson (ajonsson at kapsi dot fi),
comments and work by others, especially millert@.
"That looks good to me." millert@